Electric toothbrush



FIG. 1 is a perspective view of our new design;

FIG. 2 is a left side elevational view of our new design, the right side elevational view of our new design being a mirror image thereof;

FIG. 3 is a front elevational view of our new design;

FIG. 4 is a rear elevational view of our new design;

FIG. 5 is a top plan view of our new design; and,

FIG. 6 is a bottom plan view of our new design.

The broken line showing of portions of the electric toothbrush is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an electric toothbrush, as shown and described. 